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X(3), X(4), X(1316), X(2698), X(2782) Brocard points four foci of the MacBeath inconic : X(3), X(4) and two imaginary 

This isogonal focal is the locus of foci of inscribed conics centered on the line X(5)X(39). See also K164. K166 = nK(X6, X3569, X3). The singular focus F is X(2698). 
